OP, I have been thinking about your problem, and if you find no other solutions, you might be able to DIY. I would use a suitable water based paint remover to get all of the old paint off. Then if necessary diamond buffing pads on a drill or angle grinder to get to a nice clean smooth finish. As for new paint, I would look into the concrete "stains" these are Xylene based and I have this on our driveway for over 8 years with no signs of wear. I have seen this type of paint at Sherwin Williams.
Feel free to send me a PM, as i have the diamond polishing pads and associated equipment.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV.
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